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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ed7c90167fcfece82b8c22dce45d1c6b4234d4d79a1dacc820762cb97de426' 
  AND token = 'wUyUC1rg4WcTsLNJkw/3gi6Xm5hpeyMVUHcHLF+YX3k=' 
  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"
    }
  }
}