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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9adad4c6f8de12410c0a49ca6d23c98418499e316c7a0fa9e673339fe3f32f8f' 
  AND token = 'Dqt1UeV30vpcGRwc8ZsZKtw6gKAfoFwl1LvrmUdrfFQ=' 
  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"
    }
  }
}