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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45833ecbde0babeea79ed465f4df73b05a978636b2dfec93a16ee0c36bafa2e3' 
  AND token = 'TuuSaoxFXzaLHeP1VsTE5h4nOl2UPJUV5dUd7cT14ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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