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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aab496f10ca64e0d6ff6623e10ae2fcb8014791dc38ffe834350d55b75d4aa9c' 
  AND token = 'LdHv1AOptXOHaWeP1Vy8cbpAPLlz+uVlMcNMuBbP7mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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