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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2b62953c56e2a1672b24ec1c49cde141d262b1abe9d15b8e185d134c7c62c1e' 
  AND token = 'R9mZHRYTO6H8g1WcyBrn/4283st4VzEZD6v8xUmNZko=' 
  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"
    }
  }
}