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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e574a06e1e659ae2a4c8866ac2b4924b70cd9e66074f6068f3a946403c716684' 
  AND token = 'z5PeKObRfYmWO/j43PVHyf+MyY31IWYRKZrHPX1Vp4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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