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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d4aba2b37d078b73caa1e114fe8026f3168c84df6ad399a2323f3fa02cdecac' 
  AND token = '3Ywht4KOIf57O5ZwtC3jXR++CgM7+8NnyRE64AkopAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00113

JSON explain

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