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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ea3e83bc8fb310a4045cf8f64931ccdae41e77252940cc0f9a9fefa3a7fa20' 
  AND token = 'HGkDMRMeEivM6eSHCJU1nb//za2oBdOWgHoLtASN/80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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