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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f0272c228f2e95e0aa8cebb3ded1de79010cf2254dabcb32d9a616e3b4dd42' 
  AND token = '+Xes2XxkBYYoUb6gP2M38x/IR9XS55NI5X9IqO+VqMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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