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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d65bbe39bd337f516964731174a295c2720bdb5d9edcda8c9d36d68ebfd06e0' 
  AND token = 'UiJ2H/dGai4jAlLwMmew1p2gjKHR5WuWreH+zUomDLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}