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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57dd779463d0d39b22e4850ced957d6edaa3cd7b02bd1021c48f5a2d2711771' 
  AND token = '48DnlYZ3JKBJB8Kjj2RArOMZqdHV4EVcDyE1MoO1i6k=' 
  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"
    }
  }
}