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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e000df5a5f9d9ac9311989ffbab510502fc1847f27580063cd470aa3dc182885' 
  AND token = 'mcJADEsCUwPbha7w6houv7cYgLBDq6VwfWPMA/csPcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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