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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e08914b471cf0e40a558b6b4c867aa658e08e77e858bbe182e8de7c1f9295d57' 
  AND token = 'l9Yp8r56CmNM5n0lWYHfFtCyFAIkbfQFsXjkV4pDB4A=' 
  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"
    }
  }
}