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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda105a29b9776dd6587929e5800095e404ef7962b50301ced3667463397089a' 
  AND token = 'jWw691pUdT6SDyJog5KTBFPkV9SK4Urdtti54tKrutA=' 
  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"
    }
  }
}