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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7fc65d3f8afbd994598e1a16da405dd0ec21649422cbe93acc70a62863c33b6' 
  AND token = 'OKzpzdUNxaDaIlO8S+kRkRA4n1zq2QP6Py2oeBgKbwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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