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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5a0135ef5a2e83e6cabc06401f3086b304672dd51d6c8dd3554681170863c1e' 
  AND token = 'I4a/+/qdvVB3eKsgL6a1JaARZ9LM6nP601DjGgLETes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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