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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc63257e77837a21893041c9d2239615ddfbbd05a491f8fba348caf724ba412a' 
  AND token = '7sV2kroAilrtb7LZFeMjzBVlYvYdAi2kwn7nBv1UVUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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