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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f5603b5a12b3c5a26629c9d606318007c2900566635fc941017cb89a7db90b8' 
  AND token = 'oqocKyEFwsEsaXoAHAVohQeTuD/EjWP11lcoYBqBp4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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