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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b577709a77e6576c5cd1b55f9782b092e783cdddec52984e90f7919da7a649' 
  AND token = 'HN2svAGSyTecAkvyOoxjRscidsmga99IhhyMl/872Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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