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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8f4817884deb29ebb3aa1fd8bd99b2d75dc1f87819781c2df9dc2197ec49fd' 
  AND token = '/YyQp1sMA054fyOFSqf0ar9viv0x5nToCwp4CPnK90U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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