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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2790fc27e53042a839035bace0fafe0e643035f21f38e22d7a9ba8c08e569e8' 
  AND token = '/HVksHhROXQS2v08JfsM7NiAyPKEfXQEAveJjD7Hf2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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