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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b53913a6b2b7500d4c8b6ce285f76df6dc2651fd60d08ce46067b3df0a0cfca' 
  AND token = 'eUBAom+AYu+4Su4H1r20jqRe+CfBLXmRLwyA7pBbl2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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