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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdea9b1b19129d2a282aa8ec54334b583ed91c09739a56bd64d25a69915727f8' 
  AND token = 'HCsepIOtCRd1gMQSmOqpRTcNX50aT/2abQsJZ8A5DgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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