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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d8025eb1bb64030550e141174865836f85072d10e6224d6c8980090463e03d7' 
  AND token = 'GJH58HHxh/cE3eDcXnrMg1/hhP4TRh2wyKUVmarF0Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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