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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0644e3fa76e492be79a1d7d89da0b055e1d12eb102f9850198145001b5d7d0d8' 
  AND token = 'u2CydDmvPc4mOttDR3FnZoEtygIojhOKUvsrP3fAfs4=' 
  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"
    }
  }
}