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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ff18fd3eb0142d1b598a3e997668e8cf6c09773971557a2f14806dc7e60463b' 
  AND token = 'HkP3ejwFGmOQ8tcA+dRQn5xf73La9L9GCL7HtKS1Myw=' 
  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"
    }
  }
}