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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc6ec9e84b3bc2e39fdd158496e75ddeae9090c5e0f4d3d9366a82262c544466' 
  AND token = 'Ks8axsf/lyRfZokxl8s+zUUzzmdUJEufh6dXcefNPHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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