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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '215990df109c0405459ff1c2e86d037ad534e4342d2519b6f43f0e37b1563638' 
  AND token = 'qNc4W3GUrkJ3cy8nlA+0qtq/m0WJARCnxJqJDIOMZdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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