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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e24fa1b8db4b41db8dd830589e741be70d1adfdb5b2ec87c4d37c22872551434' 
  AND token = '7uOmDEb0Z4rQ6Th2L3V+N2BEdPRwpVUCiO2SEHz7O2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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