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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03573909bc407052eca2c0c6142235bba339464d06d8e61e41258a1f08b4a6aa' 
  AND token = 'RKyERBBH8NlfMCfODza/MFGW5p2JkQLVNxlobEYa/Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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