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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b178da4c29d8bb5300c2ed39a6e3c374f91d726521a557343d8a91e4b1c79620' 
  AND token = 'ESF9dZPPX8weJWcIPMk4NFXorrAHhdAjNprP2esj1js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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