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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b7ee9d14a2cdd58ed1356921c9ea8b35f37b6e662a5c1d0170a5992a75d7009' 
  AND token = 'JPSmSSQjGv9/QvqIb7VEtK9Y/gJxa2/w3EzkTlE/x48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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