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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9f3c14b08d5cea3262c892de18dc6d1cef1bad2ba041af1588f7f126428e76' 
  AND token = 'ciFF6VJH3qEin4A/TOkzMVUP8ZnKEDL87yHEcl+QwGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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