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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8beb1d70f624ee32527900d87dcfbc9b2f252fcfe57977bc5e93be7223d256b0' 
  AND token = 'ZGxgrfGtay+4T1t2iNTeR/x1FS/eB9lHPJnKmPZnVLs=' 
  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"
    }
  }
}