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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d0721a91b21a0a2a329419a3ca0328d20539f1f4c18f432ad3f054118633e5' 
  AND token = 'SM3eYczQBRZIzxr8l9sOknrg5atCTfocfv/nYYxhKP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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