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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '365b65ad64d01bf2c858cc4607183651a71061baf135f9c53344726628031f82' 
  AND token = '/hMyhkvXkJCk0sYAfHZHJ6SyJc2t33/T1d84iBojBzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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