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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd091f75e65260c8f80c36731aca79c0bbc6e0851d8ff1a98995cd5051c63a73e' 
  AND token = 'cQKmalnTDZRj/z9NeWlIb+3+I+ogqujZEbzA6K+nBEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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