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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1a443069b34d27f5a912105ddaa7ea0ef2fc3b774e57046b26735909b1ab846' 
  AND token = 'N8Q4VavJKLPrJsSmtk63Mv6dof3TC32kRJGI+CGWccw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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