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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac4567a22c528aa80e0b4bd89aa5298cba6ae93fb97ab75dbe5745db95556bc' 
  AND token = 'm/c+6vd+K61ZNvouWe9O/or8vtiKqCHQ8EC215uG2yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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